update rust toolchain (#607)

Signed-off-by: qupeng <qupeng@pingcap.com>

librocksdb_sys/build.rs

@@ -17,7 +17,7 @@ extern crate cmake;
 
 use cc::Build;
 use cmake::Config;
-use std::path::PathBuf;
+use std::path::{Path, PathBuf};
 use std::{env, str};
 
 // On these platforms jemalloc-sys will use a prefixed jemalloc which cannot be linked together
@@ -27,7 +27,7 @@ const NO_JEMALLOC_TARGETS: &[&str] = &["android", "dragonfly", "musl", "darwin"]
 
 // Generate the bindings to rocksdb C-API.
 // Try to disable the generation of platform-related bindings.
-fn bindgen_rocksdb(file_path: &PathBuf) {
+fn bindgen_rocksdb(file_path: &Path) {
     let bindings = bindgen::Builder::default()
         .header("crocksdb/crocksdb/c.h")
         .ctypes_prefix("libc")

rust-toolchain

-nightly-2020-07-01
+nightly-2021-01-25

src/merge_operator.rs

@@ -61,7 +61,7 @@ pub unsafe extern "C" fn full_merge_callback(
     let buf = buf as *mut u8;
     assert!(!buf.is_null());
     *new_value_length = result.len() as size_t;
-    *success = 1 as u8;
+    *success = 1_u8;
     ptr::copy(result.as_ptr(), &mut *buf, result.len());
     buf as *const c_char
 }
@@ -86,7 +86,7 @@ pub unsafe extern "C" fn partial_merge_callback(
     let buf = buf as *mut u8;
     assert!(!buf.is_null());
     *new_value_length = result.len() as size_t;
-    *success = 1 as u8;
+    *success = 1_u8;
     ptr::copy(result.as_ptr(), &mut *buf, result.len());
     buf as *const c_char
 }

src/rocksdb.rs

@@ -84,10 +84,10 @@ fn ensure_default_cf_exists<'a>(
     }
 }
 
-fn split_descriptors<'a>(
-    list: Vec<ColumnFamilyDescriptor<'a>>,
+fn split_descriptors(
+    list: Vec<ColumnFamilyDescriptor>,
     is_titan: bool,
-) -> (Vec<&'a str>, Vec<ColumnFamilyOptions>) {
+) -> (Vec<&str>, Vec<ColumnFamilyOptions>) {
     let mut v1 = Vec::with_capacity(list.len());
     let mut v2 = Vec::with_capacity(list.len());
     for mut d in list {
@@ -345,7 +345,6 @@ impl<D> DBIterator<D> {
 #[deprecated]
 pub type Kv = (Vec<u8>, Vec<u8>);
 
-#[deprecated]
 impl<'b, D> Iterator for &'b mut DBIterator<D> {
     #[allow(deprecated)]
     type Item = Kv;